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SP6121 Datasheet(PDF) 23 Page - Sipex Corporation

Part # SP6121
Description  Low Voltage, Synchronous Step Down PWM Controller
PDF  42 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6121 Datasheet(HTML) 23 Page - Sipex Corporation

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Nov 28 06 AppNote: SP6121 as a Synchronous Buck-Boost LED Driver
© 2006 Sipex Corporation
Page 3
the battery voltage. The converter will automatically adjust its Duty Cycle
depending on these factors. The below graph shows the area which will be used.
Note that the Duty Cycle will stay around 50%. This value will be used as a
reference for calculating the external components.
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
D : Duty Cycle
Boost Cell
Buck Cell
Current
sensing
Current
Sensing
Amplifier
LED
Disconnect
OverVoltage
Protection
SP6121 Buck-Boost Application Schematic



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